The biodiesel can be used as substitute product of petroleumfuel . It is can be produced by vegetable oil fat and animal fat , but at present , most people using the fatty acid , swilloil , used cooking oil and leftovers which produced in refining process as the materials.

The biodiesel not only can be used for biofuel , it also can be as diesel fuel additive. In recent 20 years , using the vegetable oil to make the biodiesel to instead the petroleumfuel, it already aroused more and more attentions from all over the world . At present, the European and North America countries utilizing the vegetable oil as biodiesel materials, but Japan through recycling used cooking oil to make biodiesel. In recent years , more and more governments and businessmen are utilizing the used cooking oil to produce the biodiesel , the materials price is very

Advantaged, it also can be efficient utilized the waste, at the meanwhile, it can reduce the pollution of used cooking oil.